Negatively imaginary signals are blue (e.g.Strongly imaginary positive signals (Y=10v) are bright yellow, and weakly positive-imaginary (Y=5v) are dim yellow.X=-10 volts) is green, whereas weakly negative real (X=-5 volts) is dim green. Zero output (X=0 and Y=0) presents itself as black.when X=+5 volts, is encoded as a dim red. when X=+10 volts) is encoded as bright red. The phase affects the hue of the colour.Ĭonsider these examples (as outlined in IEEE conference paper "Rattletale"): Typically more light is produced when the magnitude of the signal is greater. The complex color-mapper converts from a complex-valued quantity, typically output from a homodyne receiver or lock-in amplifier or phase-coherent detector into a colored light source. This is done with a complex number to RGB color-mapper, as follows: The result is to go around a color wheel with phase as angle, and with the light qualtity is the signal strength (sound level). We bring these out as RGB color signals to an LED light source. We use an Arduino with two analog inputs and three analog outputs to convert from XY (complex number) to RGB (Red, Green, Blue color), as per the swimled.ino code supplied. Together the voltages present at X and Y denote a complex number, and the drawing above (left) depicts the Argand plane upon which complex valued quantities are displayed as color. The output of the lock-in amplifier is a complex valued output, which appears on two terminals (many amplifiers use BNC connectors for their outputs), one for "X" (the in-phase component which is the real part) and one for "Y" (the quadrature component which is the imaginary part). The sound comes from the output of a lock-in amplifier referenced to the frequency of the sound waves, as explained in some of my previous Instructables, as well as some of my published papers. To convert sound to color, we need to build a sound to color converter. Thanks to Arkin, Visionertech, Shenzhen Investment Holdings, and Professor Wang (SYSU). Thanks also to Stephanie (age 12) for the observation that the phase of ultrasonic transducers is random, and for help in devising a method of sorting them by phase into two piles: ``Stephative'' (Stephanie positive) and ``Stegative'' (Stephanie negative). Thank you to many past and present students, including Ryan, Max, Alex, Arkin, Sen, and Jackson, and others in MannLab, including Kyle and Daniel. The sound waves drive a color LED, and the color is the phase of the wave, and the brightness is the amplitude.Īn X-Y plotter is used to plot out the sound waves and conduct experiments on phenomenological augmented reality ("Real Reality"™), by way of a Sequential Wave Imprinting Machine ( SWIM).įirst I'd like to acknowledge the many people who have helped with this project that started out as a childhood hobby of mine, photographing radio waves and sound waves ( ). (Leftmost, interference pattern with two microphones at 40,000 cycles per second top right, single microphone at 3520 cps bottom right, single microphone at 7040cps). Here you can see sound waves and observe the interference patterns made by two or more transducers as the spacing between them is varied.
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